Dixie4wd has a free overview map, as noted earlier. Updated 6 years ago. Great overview, missing many many trails.
OnX is crowdsourced. so a "trailhead" might start at the campground, might start at McDonalds or might actually start at the trailhead....and who knows if the person mapping actually knows the route. I use OnX for mapping, and an overview only. I have some stuff that's only on OnX too
CartoTracks is accurate. Lots of locals, including me, had the owner Jake ride with us as we mapped the trails. The gps track is down the center of the trail, and follows the correct/recognized route. Nearly all of the current routes are on it (including some I've yet to run) No clutter from someone's track across the sand too....
Sand Mountain ratings are from 1-15. 9's "might" have been done with a full body earlier this year, but the rains in August about guarantee that's not happening presently. 15, never completed but mapped. 14-13, arguably rear steer only. 12-11, drag axle buggy. 10-9, lighter buggy. 8-7, full body, 37's for most. 6-5, 35's for most. I opened/named 777 with my FZJ80 on 35's
Then look at the options, and there are thousands....we run TNT as a 12-13 versus the 9 it's mapped at. Nasty Half goes from a 9 to a 13 quick too. We have climbs on a few trails that only a handful have ever run.
Obviously there are a few badass web wheelers who will claim they ran a 13 rated trail in their JK, not even knowing they bypassed all the real stuff. And someone else will angle the camera to make The Chute look ridiculous (which I have done with my 1986 RHD BJ74 Land Cruiser on 33's and no spotter)
BEST option, run with a few locals....the South West Adventure Group on FB has someone out there damn near daily.